Top 10.707

Angle AEP = 30

Green / Shaded = 0.680174761588

Improved / Elaborated

X = ABC = 60

Blue Triangle Area = 5

Orange Circle Area = 16.7156585339

Easy Way by Means of Regression

X = BD = 9.2736184955

Rectangle ABCD Area = 150

2 Purple = Blue + Green

a / b = 4 / 3. X / Y = 9 / 4

Baseline AD = 20.874342087